Machinery for manufacturing double-twist screw-atjgers



- UNITED STATES 'PATENT orrIoE.

\ E. `LHOMMIEDIEU AND R. N. WATRGUS, OF CHESTER, GONNECTIGUTf Maonmaar ron MANUFACTURING DoUBnarwrs'r i SCREW-Anguita Specification forming part of Letters atent Y Double-Twist Augers, and in the Machinery Necessary to Effect the Same, and 4the following is a full and exact description, prom-A ising that the object of our invention and improvement is to form the twist of the auger by machinery adapted to that object and the lip with the center-worm or pint-le by swaging in dies formed for that purpose, thereby producing the article more eX- peditiously and more perfectly than by any process heretofore known.`

To enable others skilled in the art to make and use our invention and improvement, we describe its construction and operation as follows, consisting of two parts, both of which are necessary to form the auger.

1. The machine for form'ng the twist- This part of the machinery consists of a firm bed, supporting two upright posts of iron or other metal of suitable size for strength, well secured to the bed, standing one in `front of the other, about 12 inches apart in the clear and rising about 6 inches high. Through these posts near the top we pass a horizontal shaft or mandrel of'iron or steel, about two and a half feet long and one inch and a quarter in diameter. On the front end of this shaft, and extending about twelve inches from the end, we make a spiral semi-circular cavity so deep 'as to pass a little below the center of the shaft and on an angle of about 45 degrees with the line of the shaft, so that the end of the shaft moving in thefront post will resemble the blade of a single twist auger. The remainder of the shaft is armed with a screw thread set at the same angle with that of the spiral cavity above described, which thread plays into a corresponding female screw in the rear post. On the end of the shaft projecting behind the rear post, we liX a crank to turn the sha-ft by. We then place a firm iron rest or stud in front of the front post, rising about 3 inches above the bed, and having an open mortise from the top two inches deep for the roller hereafter de scribed to play in, and grooves on the top of the sides of the mortise to receive and No. 851 dated July 24, 17838; Reissued July 30, 1845,

No. 72. l

support the axle of the roller.

The roller l is of iron or steel about 3 inches in diame ter and one linch thick, the edge"` being roundl ed to a semicircular face, fitting the spiral cavity of the shaft. The rest, supporting the roller is placed diagonally on ,the base in front of the post, and under the projecting shaft, the plane of the roller forming an` angle with the shaft` of about 45 degrees, so that the face edge of the roller will cor-` respond with and fit into the spiral cavity of the shaft. `The rest for the roller must 'be secured to the bed insuch manner that it may be raised orslowered, and when setfor use, the distance between the roller and the shaft, should be the thickness of the plate to be twisted. For further illustration we refer to the drawings accompanying this specification aspart thereo VFigure 1. A,the bed or base; B, b the ports. C the shaft or mandrel, eXhibitin at one end the spiral semicircular cavity an at the other end at E a screwthread F female screw or box. G the crank to turn the shaft. H the rest or stud to support the roller. I mortise for the roller to move in. K` the roller. i n

2. The part of the machinery, to, form .the Zips fwfizk'tkc center worm or pinda-This part consists of a lower die of suitable form, firmly based, and a corresponding upper die upon the lower end of an upright shaft,`

made to rise and fall accurately, and with a i with a shank or tenon at thebottom to secure it in the bed, or on a block. Through this stock is an open orifice one and a half inches square more or less from the front to the rear. The bottom of this orifice being about 2 inches from the bottom of the stock, to give access to the dies. This orifice is crossed at right angles by another mortise 12 inches square passing through the stock from side to side, to receive a horizontal bar, containing the bottom die, the bottom of f this mortise being an inch lower than the bottom of the orifice of access first mentioned. From the center of the top of the stock, another mortise of the same size des'cends perpendicularly to the horizontal mortise. We then take two bars of steel of a size to fill these mortises; the piece for the horizontal mortise, about 8 inches long, having a mortise and key at each end to 'secure Y it rmly in the stock. At thecenter in the upper face of this'bar, near the front-edge cut a swage or die in the shape desired for' the lower half of the head, lips and center worm of the auger when laid flat r horizontally upon it. Then in thelower end of the perpendicular bar, make a corresponding die for the upper side. The length of the v perpendicular bar may be such as to extend above the stock so far as will be most convenient to apply the necessarypower, either by the stroke of a hammer, .a drop or any other force.

For further illustration see the drawings Fig. 2. N, represents the cubical stock. VO its tenon to hold it rm in the bed. Fig. 3, P orifice of access to the dies. S, horizontal mortise for bottom dies. R mortise for perpendicular die. Figs. l and 5, Sb the horizontal bar with the key T and die in place. Figs. 5 and 6, the perpendicular bar with die s, on lthe lower end. Y Y Y The operation of thismachinery is as follows. Havingrby forging, in the usual manner, formed the shank, and plated the bladel of a suitable width and thickness, leaving sufficient matter for the head; the edges 0f the blade should be turned up by swedgingV or otherwise so as to form a semicircular hollow to Afit the semicircular edge of the roller. The blade is then bent from the line ofthe shank about 4:5 degrees or so as to fit the diagonal positions of the roller.

Then heat the blade and place Vthe hollow of the part nearest the shank, on the roller and under the corresponding spiral cavity of the shaft and hold it firm: then by turning theV 'Crank 'of the Spiral Shaft-.the blade thus interlocked is twisted uniformly and Vdrawn from the machine straightened to the line of the'shank. Then heat again the end to form the head, and place it on zthe lower .die ofthe swaging machine and bring down the upper die with the necessary power and the lips with the center worm or pintle will vbe formed, ready for the finisher, in a more perfect manner and with greater expedition than by any other modenow in use.

This machinery in its size and proporsame principle and substantially in the same manner and form.

2. VWe also claim the method of making or forming the lips, and the center worm or pintle of the double twistauger by means of the swedges constructed as herein described and for our invention and improvement thus specified and thus claimed we solicit Letters Patent. n

Chester July 16th, 1838.

LEZRA LHOMMEDIEU.

RICHARD N. VVVATROUS.

Witnesses:

JULIA LHOMMEDIEU, STEPHEN LHOMMEDIEU.

[FIRST PRINTED 1914.] 

